Equal-Weight S&P 500 Trails Market-Weighted Index by 6% in Six Months

The S&P 500’s equal-weight index lagged its market-cap-weighted counterpart by about 6% over six months, while the median constituent was about 15% below its 52-week high, exposing a sharp split between index leaders and the typical stock.

A small group of large technology companies has supported the broader index while ordinary stocks remain under pressure. Rising Treasury yields, the dollar and oil prices have tightened U.S. financial conditions. The S&P 500’s equity risk premium has slipped below zero, leaving stocks less attractive on valuation relative to Treasury bonds.

The two weighting approaches allocate influence differently. In the standard S&P 500, companies with larger market values carry more weight. The equal-weight version resets each constituent to a 0.2% target share at quarterly rebalancing, reducing the largest companies’ influence on its results.

Tighter financial conditions are having an effect similar to a Federal Reserve rate hike, with pressure concentrated among ordinary stocks. The strain is showing up in valuations without a clear threat to economic growth. Nominal GDP growth remains strong and corporate earnings are still growing, though further increases in real interest rates could weigh on valuations.

Financial stocks’ ability to stabilize and a decline in Treasury volatility are key indicators to watch. The gap could narrow if ordinary stocks rebound, or if large technology shares weaken and pull the index closer to the broader market’s performance.